How are the area formulas for triangles, parallelograms, and trapezoids related to the area of a rectangle?

I'm pretty sure they all divide by 1/2 at some point. 

Idon’t have want a lot more

So don't take my word i'm not exactly a mathematical person but i would assume a. because while selling the soap every month you increase in sells so you would by 11 percent. the you would get the factor 0.89 which if i had to guess would be the monthly profit over 11 probably wrong tho